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AIR PRESSURE
SWITCH
BLOWER
GND
L1
N
IGNITER
FLAME
SENSOR
GAS VALVE
SOLENOID
POLARITY SENSITIVE DO NOT MIS-
MATCH WIRING! FAILURE TO CONNECT
CORRECTLY WILL PREVENT THE UNIT
FROM FUNCTIONING PROPERLY.
FLAMMABLE
VAPOUR
SENSOR
CONNECTOR
HIGH LIMIT
SWITCH
Figure 22 Robertshaw Wiring Diagram - Control
Figure 23 Gas Control/Thermostat Details (Robertshaw)
GAS CONTROL
SWITCH (ON)
OUTLET TO MANIFOLD
DOOR ASS’Y (UNDER)
3/4” NPT WRAP
WITH TEFLON TAPE
2 WRAPS MIN.
GAS VALVE
SOLENOID
CONNECTOR
FLAMMABLE VAPOUR
SENSOR 2 PIN
MOLEX CONNECTOR
QUICK CONNECTS
FOR POWER SUPPLY
AND IGNITER
TERMINAL BLOCK BLOWER
AND JUNCTION BLOCK 8
PIN MOLEX CONNECTOR
GAS CONTROL-VIEW OF ELECTRICAL
CONNECTORS, WITH COVER REMOVED
INLET
PRESSURE
PORT
OUTLET
PRESSURE
PORT
(UNDER)
GAS INLET
1/2” NPT
SYSTEM
STATUS
CODES
LED INDICATOR
140F MAX. DIAL
GROUND CONNECTION
160F MAX. DIAL
MANIFOLD
PRESSURE
ADJUSTMENT
(REMOVE
DIAL FOR
ACCESS)
GAS CONTROL-VIEW FROM GAS INLET
WITH TEMPERATURE DIAL REMOVED
WARNING
Electrical Shock Hazard
• Disconnect power before
servicing.
• Replace all parts and panels
before operating.
• Failure to do so can result in
death or electrical shock.
– 18 –
Figure 21 Flammable Vapour Sensor (exploded view)
SCREW
MOUNTING
BRACKET
FLAMMABLE
VAPOUR SENSOR
(PULL TO REMOVE)
COVER*
* ROTATE LEFT (CCW)
TO REMOVE